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Saab 21R
The Saab 21R was a Swedish twin-boom fighter/attack aircraft made by Saab. It was a jet-powered development of the piston-engined Saab 21 which along with the Russian Yakovlev Yak-15 was one of the only two jet fighters successfully converted from a piston-powered aircraft to enter production.〔Gunston 1995, p. 472〕
As a fighter, its service designation in the Swedish Air Force was ''J 21R'', and saw service in the late 1940s.
==Design and development==
In early 1945, Saab launched a project to determine how to provide the J21A with a jet engine to get the experience of jet engines and flying at high speeds. The goal was to catch up with the development of jet aircraft, which were moving ahead fast in England, where, among others, De Havilland already had the De Havilland Vampire in production.
When the project started, the engine choice was an open question. However, as the project progressed it became possible to buy a "Goblin 2" jet engine from De Havilland Engine Company, along with the license to manufacture in Sweden. This engine became the Air Force's first Jet Engine, RM1. The rebuilt J21A received type designation J21R. First flight with Saab's first jet took place on 10 March 1947.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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